Rear-Axle Bias Control
Designed to pair with a larger front BBK and help set rear brake bias on track, time-attack, drift, or endurance builds.
Email: sales@ttsport-racing.com
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Product Detail
xRacing Series · Circuit · Rear Axle · 6-Piston
TR61 Circuit Racing Rear 6-Piston Big Brake Kit
The TR61 Rear 6-Piston Big Brake Kit is a Racing Series — Circuit caliper engineered for track, time-attack, and endurance use. Monoblock forged aluminum body, six racing pistons without dust boots, and a two-piece directional rotor package built for thermal repeatability and predictable rear brake balance.
Why Builders Choose the TR61
The TR61 is a rear-axle race caliper designed to pair with a larger front BBK and give you a tunable rear brake bias. The 6-piston layout uses a staggered bore configuration, 27 / 28.5 / 32 mm, to load the pad evenly across its length, reducing taper wear and extending pad life under repeat heavy braking. Piston seals run open, no dust boots, for faster heat rejection and easier service between sessions.
Monoblock Forged Caliper
Monoblock forged aluminum body delivers high stiffness and low flex under load.
Staggered 6-Piston Bore
27 mm × 2 / 28.5 mm × 2 / 32 mm × 2 piston layout helps load the pad evenly for consistent pedal feel.
Two-Piece Directional Rotors
Ø355 or Ø380 mm × 32 mm two-piece directional rotors, internally vented, fixed or floating depending on rotor size and application.
Standard or Racing Package
Standard 0–600 °C pad and rotor package for club days and HPDE, or Option B 0–750 °C package for time-attack, endurance, and sustained heat cycles.
Race-Service Hardware
Stainless braided lines, radial brackets, open racing pistons, and required bedding instructions support a real track workflow.
Technical Specifications & Kit Options
| Brake Caliper | ||
|---|---|---|
| Series | Racing Series — Circuit | |
| Model / Application | TR61 | |
| Axle Position | Rear | |
| Piston Count | 6-piston | |
| Piston Type | Racing pistons, no dust boots | |
| Piston Diameter | 27 mm × 2 / 28.5 mm × 2 / 32 mm × 2 | |
| Caliper Dimensions | 277.8 mm × 167.4 mm × 80.3 mm | |
| Total Piston Area | 40.28 cm² per caliper, all pistons combined | |
| Construction | Monoblock forged aluminum | |
| Net Weight | 2.90 kg per caliper, without pads | |
| Surface Finish | Nickel-plated | |
| Custom Color | Not available on this model | |
| Recommended Wheel Size | 18 in or larger | |
| Recommended Rotor Size | Ø355–380 mm × 32 mm | |
| Brake Rotor Options | ||
| Rotor Option | Standard Race | Option B — Endurance |
| Rotor Material | Heat-treated high-carbon cast iron | Racing-grade heat-treated high-carbon cast iron |
| Rotor Dimensions | Ø355 or Ø380 mm × 32 mm | Ø355 or Ø380 mm × 32 mm |
| Construction | Two-piece, internally vented | Two-piece, internally vented |
| Rotor Hats | Application-specific alloy rotor hats | Application-specific alloy rotor hats |
| Mounting | Fixed or floating, depending on rotor size and application | Fixed or floating, depending on rotor size and application |
| Directional Design | Yes — left/right specific | Yes — left/right specific |
| Rotor Face Pattern | Curved slot / Grain Slot / Wave Slot / Drilled & slotted | Wave Slot |
| Best Use | HPDE, autocross, club racing | Time-attack, endurance, sustained heat cycles |
| Brake Pad Options | ||
| Pad Option | Standard Race | Option B — Endurance |
| Compatible Rotors | Iron / steel rotors only | Iron / steel rotors only |
| Operating Temperature Range | 0–600 °C | 0–750 °C |
| Average Friction Coefficient | μ ≈ 0.38 | μ ≈ 0.45 |
| Recommended Use | Club days, HPDE, mixed street / track | Endurance, time-attack, back-to-back race sessions |
| Lines, Brackets & Service | ||
| Brake Line Construction | Three-layer reinforced | |
| Brake Line Material | PTFE inner / SUS304 stainless braid / PVC outer | |
| Caliper Mounting | Radial mount with vehicle-specific caliper brackets | |
| Caliper Brackets | Vehicle-specific radial brackets | |
| Brake Line Fittings | Vehicle-specific, caliper-side and chassis-side | |
| Bedding-In Procedure | Required before track use | |
Nickel-plated finish is fixed — chrome and color changes are not available on this model. Rotor diameter and pad compound should be selected according to front BBK setup, rear brake bias target, wheel clearance, and event format.
Package List
Calipers ×2
2 × TR61 rear monoblock forged 6-piston calipers with nickel-plated finish.
Brake Pads
Brake pads for both rear calipers, selected from Standard Race 0–600 °C or Option B Endurance 0–750 °C package.
Brake Rotors ×2
2 × two-piece internally vented rear rotors, Ø355 or Ø380 mm × 32 mm, left/right specific.
Caliper Brackets ×2
Vehicle-specific radial caliper brackets for correct rear caliper alignment.
Rotor Hats ×2
Application-specific alloy rotor hats matched to rear hub location and rotor offset.
Brake Hoses ×2
Stainless braided rear brake lines with PTFE inner, SUS304 stainless braid, and PVC outer sheath.
The Bespoke Engineering Process
Every TR61 rear circuit racing system is engineered around the vehicle’s rear knuckle, hub location, rotor hat offset, wheel barrel, spoke clearance, front BBK setup, brake line routing, and rear brake bias target. The goal is not a generic universal fit; the goal is a rear brake package that works with your chassis geometry and gives the driver repeatable pedal behavior under sustained track heat.
1. Technical Consultation
We review the chassis, rear suspension and knuckle setup, motorsport use, target rear brake behavior, front BBK setup, wheel package, tire compound, ABS / proportioning strategy, and whether the car uses OEM or custom rear uprights.
2. Data Submission
For OEM knuckles, provide chassis details, wheel specs, front brake setup, and rear hub information. For custom knuckles, motorsport hub conversions, or non-OE rotor offsets, provide CAD files, technical drawings, hub-face data, rotor mounting dimensions, or accurate bracket mounting-point measurements.
3. Engineering Review & Approval
TTSPORT confirms rotor size, vehicle-specific caliper bracket geometry, rotor hat offset, brake line routing, front/rear bias target, and bedding requirements before production, bench-fit, and shipment.
If you are unsure whether your wheel, rear knuckle, rotor offset, front BBK setup, or brake line routing is suitable, Contact us before ordering so the engineering team can review the build details.
Installation & Break-In
- Every TR61 rear kit ships with vehicle-specific radial brackets and braided lines cut to length.
- Rotor diameter, Ø355 or Ø380 mm, is confirmed during the engineering review.
- Standard or Option B pad and rotor package should be matched to your event profile and front BBK setup.
- Minimum wheel size is 18 in, but spoke profile and offset still affect final clearance.
- Racing pistons without dust boots are intended for motorsport and track use, with regular inspection between sessions.
- Proper bed-in is required before hard use to transfer pad material and stabilize the friction surface.
- Instructions ship with the kit and must be followed before first hot session.
Frequently Asked Questions
Is the TR61 a front or rear caliper?
Rear axle. The TR61 is designed to pair with a larger front BBK to set rear brake bias on a track or drift build.
What rotor size should I run?
Ø355 × 32 mm or Ø380 × 32 mm, both in two-piece floating or fixed construction depending on the application. We confirm sizing during the fitment review.
What's the difference between Standard and Option B?
Standard uses high-carbon iron rotors with a 0–600 °C pad window and μ 0.38. Option B uses racing-grade iron rotors with Wave Slot face and a 0–750 °C pad window with μ 0.45 for endurance and sustained heat.
Will it clear my wheels?
Minimum 18-inch wheels. Wheel spoke profile and offset still matter — send wheel specs and we'll confirm clearance before production.
Are these calipers street legal?
The TR61 uses racing pistons without dust boots and race pad compounds. It's intended for motorsport and track use. For street/track dual-use, ask about pad compound options.
Is bedding-in required?
Yes. Proper bed-in is required before hard use to transfer pad material and stabilize the friction surface. Instructions ship with the kit.
Spec Your TR61 Rear Kit
Talk to our brake engineers about rotor size, pad compound, rotor hat offset, caliper bracket geometry, and front/rear bias matching for your build.
Care Guide
xBrake Kits · Fitment · Installation · Care Guide
Brake Kit Care Guide
A brake kit is not just a pair of larger calipers. Calipers, rotors, pads, hoses, brackets, rotor hats, mounting hardware, brake fluid, wheel clearance, and bedding procedure all work together as one system.
This guide explains how to confirm the right TTSPORT brake kit before ordering, what to check before installation, and how to care for the system after installation.
1. Before Ordering: Confirm the Full Vehicle Setup
Do not order a brake kit by vehicle name alone. The correct kit depends on the vehicle, axle position, wheel package, driving use, and brake system layout.
- Vehicle year, make, model, trim, market version, and chassis code if available
- Front or rear axle position
- Current brake rotor diameter, thickness, and caliper type if known
- Wheel diameter, width, offset, spoke shape, and inner barrel clearance
- Tire size and vehicle weight changes from armor, cargo, towing equipment, or track setup
- Driving use: daily street, towing, mountain driving, off-road, HPDE, rally, drift, track, or competition
- Whether the vehicle uses electronic parking brake, brake pad wear sensors, ABS / ESC systems, or special hydraulic routing
Brake kits are application-specific. A visually similar kit can still have the wrong rotor offset, bracket geometry, hose fitting, caliper position, or wheel clearance requirement.
2. Understand What Type of Brake Kit You Are Ordering
Different TTSPORT brake kit series use different hardware layouts. Always confirm what the kit includes before purchase.
Direct-Mount Kits
Use direct-mount calipers and one-piece rotors where specified. These kits do not use rotor hats or caliper brackets unless the final product page clearly states otherwise.
Two-Piece Rotor Kits
Use separate friction rings and rotor hats. Hat offset, ring bolt pattern, hardware style, and rotor direction must be matched correctly.
Racing / Custom Kits
May require bespoke brackets, rotor hats, brake lines, and engineering confirmation based on knuckle, hub, wheel, and competition use.
Off-Road / Heavy Vehicle Kits
Require extra attention to wheel clearance, tire size, vehicle load, descent control, hose routing, and dust / water exposure.
Do not assume every brake kit includes the same parts. Package contents vary by product series, vehicle application, and final order configuration.
3. Confirm the Kit Specification Before Payment
Before finalizing the order, review the kit specification carefully. Confirm the brake kit is matched to your vehicle and wheel setup, not only to the model name.
- Confirm vehicle application and axle position
- Confirm caliper model, piston count, and caliper color if applicable
- Confirm rotor diameter, rotor thickness, rotor construction, and left / right direction if applicable
- Confirm brake pad compound and intended use
- Confirm brake hose fitting type and routing compatibility
- Confirm whether caliper brackets, rotor hats, mounting hardware, wear sensors, or brake fluid are included
- Confirm minimum wheel diameter and spoke clearance requirement
- Confirm lead time, shipping method, and final invoice details
If any part is not listed in the final order or product page, do not assume it is included.
4. Before Installation: Inspect the Complete Kit
Inspect every component before installation. Do not modify, grind, drill, stretch, force, or space brake kit components to make them fit.
- Check all received parts against the order confirmation
- Inspect calipers, rotors, brackets, hats, hoses, pads, and hardware for shipping damage
- Confirm left / right caliper and rotor orientation where applicable
- Confirm rotor size, pad shape, hose fittings, bracket layout, and hardware style before installation
- Clean all mounting faces before assembly
- Confirm torque values, bedding procedure, fluid type, and bleeding procedure before starting work
- Use a qualified brake technician for installation
Safety: Brake kits affect braking force, hydraulic sealing, heat control, wheel clearance, and vehicle stability. Do not install the kit if fitment, torque, direction, clearance, or compatibility is unclear.
5. Installation Checks
Correct installation is as important as the brake kit itself. A properly engineered kit can still perform poorly if installed with dirty mounting faces, incorrect torque, poor hose routing, or trapped air in the hydraulic system.
Caliper Position
Verify caliper centering over the rotor and confirm even pad sweep across the friction surface.
Rotor Orientation
Confirm left / right rotor direction if the rotor uses directional vanes or directional face pattern.
Brake Hose Routing
Check brake hose length and routing at full steering lock and full suspension travel. No twisting, rubbing, stretching, or kinking.
Wheel Clearance
Check caliper-to-spoke and caliper-to-barrel clearance before road use. Wheel diameter alone is not enough.
Brake Fluid & Bleeding
Use the correct brake fluid type and bleed the system until pedal feel is firm and consistent.
Hardware Security
Torque all brake hardware to the specified value. Do not reuse damaged, unknown, stretched, or corroded safety-critical fasteners.
6. Bedding and First Heat Cycle
Brake pads and rotors need a controlled bedding process before full performance is available. Bedding helps create an even transfer layer on the rotor surface, improving bite, pedal consistency, and vibration resistance.
- Follow the bedding procedure supplied with the exact pad and rotor compound
- Use moderate heat first unless the supplied procedure requires otherwise
- Do not start with emergency stops on a fresh pad / rotor setup
- Avoid holding the brake pedal while stopped on very hot pads and rotors
- Allow the brakes to cool after bedding
- After the first heat cycle, inspect pad contact, rotor surface, hose routing, hardware security, and fluid leaks
Street pads, race pads, iron rotors, two-piece rotors, and carbon ceramic rotors may require different bedding procedures. Use the procedure supplied with the specific kit.
7. Initial Break-In Period
After installation and bedding, give the system a short break-in period before aggressive use. Pedal feel, pad contact, dust output, and noise may continue to settle after the first drives.
- Avoid repeated emergency stops unless required for safety
- Avoid hard track use until bedding and inspection are complete
- Monitor pedal feel, vibration, noise, smell, and rotor surface appearance
- Recheck for fluid leaks after the first road test
- Recheck torque where the kit instructions require post-heat-cycle inspection
- Contact TTSPORT if brake feel changes suddenly after installation
8. Routine Care and Inspection
Brake kits need regular inspection, especially after track use, off-road use, towing, mountain driving, winter salt exposure, or any brake service.
- Inspect brake pads for uneven wear, taper, glazing, cracking, or backing-plate damage
- Inspect rotors for cracks, heavy scoring, hot spots, minimum thickness, and runout
- Inspect calipers for fluid seepage, piston movement, dust boot damage, and uneven pad retraction
- Inspect brake hoses for rubbing, cuts, swelling, leaks, and fitting corrosion
- Inspect brackets, rotor hats, and mounting hardware for cracks, fretting, corrosion, or loosening
- Check brake fluid level, color, service age, and boiling-point suitability for your driving use
- Clean brake dust from wheels and calipers regularly, especially after wet, salty, or track conditions
9. Care by Use Case
Daily Street
Inspect pads, rotors, fluid level, and hose condition during normal service intervals. Prioritize quiet operation, smooth pedal feel, and even wear.
Towing & Mountain Roads
Check pad thickness, rotor surface condition, and fluid condition more often. Long descents create sustained heat even without track use.
Off-Road
Inspect for mud, sand, stone impact, hose abrasion, dust boot damage, and caliper contamination after trail use.
Track / HPDE
Inspect pads, rotors, fluid, and hardware before and after every event. Track heat shortens service intervals.
Drift / Competition
Check rear brake temperature, hydraulic handbrake behavior, pad wear, rotor cracking, and hardware condition frequently.
Carbon Ceramic
Use only compatible pads and approved bedding procedures. Inspect rotor surface condition carefully and avoid incompatible friction materials.
10. Stop Driving If You Notice These Symptoms
Do not continue driving if the brake system shows any of the following symptoms. Inspect the system or contact a qualified brake technician before using the vehicle again.
- Soft pedal, sinking pedal, or sudden increase in pedal travel
- Brake fluid leak or wetness near a line, caliper, fitting, or master cylinder
- Grinding, scraping, severe vibration, or heavy brake judder
- Vehicle pulling strongly to one side under braking
- Burning smell after light driving
- Loose wheel, rotor, caliper, bracket, or hardware noise
- Brake warning light, ABS warning light, or traction-control fault after brake work
Need help confirming brake kit setup or care?
Send your vehicle details, brake kit series, wheel specs, driving use, photos, and any symptoms you notice. TTSPORT will help confirm fitment, installation checks, and the correct care path for your brake kit.
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